This is a 4 inch brass vernier caliper or sliding brass gauge. This 4" brass caliper does inside and outside measurements, features a sliding dovetail groove, rigid construction, and 4"/100 mm rule with vernier scale.

• Stepped jaw construction for inside and outside measurement
• Made of brass
• Small enough to throw in your tool box, apron, or shirt pocket and versatile enough to serve many purposes.
• This 4" Brass Caliper does outside measurements features a sliding dovetail way, rigid construction, and 4"/100mm rule with vernier scale.
• Graduated in 1/16" and 1mm.